Table 1. Ranges of δ15N values and C:N ratios for bulk biomass, residual (lipid-free) biomass and lipids (total lipid extract) per species and tissue type.
n = number of individuals analyzed. Standard deviation of δ15N values from replicate measurements were for bulk and lipid-free biomass ≤0.6 ‰, for total lipid extract ≤0.9.
| Bulk biomass | Residual biomass | Total lipid extract | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Species | Tissue | n | %lipids | δ15N | C:N | n | δ15N | C:N | n | δ15N | C:N |
| Atlantic herring | Gill | 6 | 19–32 | 10.6–14.4a | 4.8–8.0a | 6 | 10.7–13.7 | 3.0–3.3 | 4 | 0.4–9.2 | 62.9 |
| Muscle | 6 | 7–40 | 11.4–16.2a | 3.3–6.1a | 6 | 11.4–16.3 | 2.4–3.1 | 5 | -0.5–3.1 | 14.6–23.2 | |
| Brown trout | Gill | 6 | 4–11 | 13.9–16.3a | 3.7–4.0a | 6 | 14.2–16.7 | 3.2–3.5 | 3 | 7.2–11.0 | 19.5–42.2 |
| Muscle | 7 | 5–25 | 13.7–16.5a | 3.2–5.1a | 7 | 14.4–17.0 | 3.0–3.2 | 5 | 4.3–9.7 | 21.3 | |
| Twait shad | Gill | 2 | 6–9 | 14.7–16.7a | 4.2–4.3a | 2 | 14.8–17.0 | 3.3–3.6 | n.d | n.d | |
| Muscle | 2 | 6–7 | 15.8–17.1a | 3.2–3.2a | 2 | 16.7–17.9 | 3.1–3.1 | 1 | 10.3 | 14.1 | |
| Green shore crab | Muscle | 3 | 2–6 | 13.2–15.8 | 3.7–5.3 | 3 | 13.4–16.5 | 3.3–4.4 | 1 | 8.2 | n.d |
| Common cockle | Muscle | 5 | 4–5 | 11.3–12.6 | 4.1–4.9 | 5 | 11.7–12.7 | 3.7–4.3 | 2 | 6.9–7.2 | n.d |
| Pacific oyster | Muscle | 2 | 2–6 | 12.3–12.3 | 3.0–3.3 | 2 | 13.3–13.5 | 3.2–3.3 | 2 | 6.0–7.0 | n.d |
| Lugworm | Head | 2 | 3–5 | 11.7–12.4 | 4.2–4.7 | 2 | 10.8–11.3 | 3.7–4.0 | 2 | 8.4–8.5 | n.d |
| Whole | 1 | 1 | 6.7 | 3.1 | 1 | 6.6 | 3.5 | 1 | 7.4 | n.d | |
a Data from Svensson et al. [18].
n.d. = not determined.